The winter storm set to hit the Maritimes overnight Sunday and into Monday morning will likely be a messy one.

This comes as 40 power crews from northeastern United States are on the way to New Brunswick to help restore power to thousands of customers, some of which have been without electricity for seven days.

They are joining crews from Quebec, Nova Scotia and Prince Edward Island that are already on the ground helping NB Power workers repair damaged poles and lines. 

CBC meteorologist Peter Coade said the parts of southern New Brunswick still suffering outages will face up to 25 centimetres of snow, followed by freezing rain or rain.

"Definitely not good news for the crews that are out there trying to restore power in the southern parts of New Brunswick," he said.

Northern New Brunswick will be spared most of the mess, Coade said, but Prince Edward Island will get up to 15 centimetres of snow, mixing with freezing rain or rain by daybreak.

Parts of Nova Scotia could be hit by much of the same. But the southern parts of the province won’t likely get any snow, and instead will see up to 30 millimetres of rain.

Coade said that could lead to local flooding.

"The rain’s going to be a problem, as well, because of a lot of the storm drains on the curb… are covered with snow and ice," he said.

In New Brunswick, there are fewer than 7,000 customers without electricity, according to numbers posted at 2:55 p.m. AT Sunday on NB Power’s website. That's a drop from more than 10,000 earlier in the day. 

On Saturday, NB Power CEO Gaetan Thomas said some homes will be without power into the new year, and that the expected storm will hamper repairs.

He said fallen trees have made access to damaged lines and poles difficult.

"What we're doing is moving some logistics and extra management and materials, things like that, down into and closer to the affected areas today, so that we cut down on any unnecessary travel that might be difficult after the storm," NB Power spokesman Brent Staeben said Sunday morning.